HELP!!!HELP!!HELP!!!

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Mar 16, 2023 | 07:43 AM

Foster0440

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3rd Gear

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HELP!!!HELP!!HELP!!!

HELP!!!HELP!!!HELP!!!2005 Ford 6.0 truck will run smooth for as long as you let it idle, once you start to go down the road and get it under a load it will die out like its starving for fuel and will not restart. FICM volts is 48 builds up over 500. fuel pressure is at 60 psi and drops down to 45 while cranking, no codes what so ever.

Mar 16, 2023 | 08:41 AM

Foster0440

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3rd Gear

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This morning when i got here i tried to crank it up again. it crunk up for just a few seconds and then died, i was able to pull up the power balance and the truck was running rough and it showed cylinder#1 was dropped and cylinder #3 was also low. again icp was building up to 600 psi then maxing out. i decided to unplug the ICP sensor and watch the ipr Duty cycle. with the ICP plugged in it was around 56% when i unplugged the ICP sensor the IPR maxed out at 69% generally i have seen them max out at 89 i dont want to just throw parts at it, any help would be nice. just never had an ipr cause this type of issue

Mar 16, 2023 | 03:10 PM

Idahoser

Tuned

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From: West TN

don't claim to have your answer but as a possibility, mine ran that way when the fuel was gelled and Diesel 911 fixed it.

Mar 16, 2023 | 10:38 PM

Jokester00

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From: The State of Confusion

What are you using to read codes?

IPR max is 85%, so 69% isn't maxed out. That just means the PCM sees the necessary ICP pressure to fire the injectors, so it's not going to keep adjusting the IPR for more ICP (or in your case, it was guessing due to the inferred value with the ICP unplugged). I'd be interested in what your ICPv is.KOEO and while cranking/idling.

Having 2 injectors dropping out isn't helping your cause either...

-jokester

Mar 17, 2023 | 12:06 AM

runthatjunk

More Turbo

Joined: Nov 2009

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From: Kansas

Quote:

Originally Posted by Jokester00

that 69 percent was when he unplugged icp. So 69 percent might be the actual percent but with icp unplugged the pressure is unknown.

To the OP, sounds like a high pressure leak to me. That seems like a big drop in fuel pressure as well, but that's not something I track so no real experience there.

Mar 17, 2023 | 11:27 AM

Jokester00

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From: The State of Confusion

Quote:

Originally Posted by runthatjunk

I understand that. However, with the ICP unplugged, the PCM defaults to an inferred reading (aka a wild guess) and commands the IPR to whatever it thinks it should be. With the ICPv reading in there to compare with ICP, we can see if the ICP value is somewhat close to what it should be based on sensor voltage. His second post said that ICP was at 600 and then maxed out. Maxed out at what - wouldn't go any higher? Then, he followed that with the IPR was 56% when the ICP was plugged in and maxed out. That doesn't make sense to me. If the ICP maxes out and won't go any higher than 600psi, the IPR should be maxed out as well @ 85% because the PCM should be commanding it to build more HPO pressure based on the demand! If we had the ICPv reading in there, that will tell us more about what the IPR is trying to do based on the commanded PCM value. Remember...IPR is a commanded value only with no feedback, so, just because it says 56%, or 69%, or 35% doesn't mean it's actually at any of those values.

Agreed about the fuel pressure though. Should not drop that far just turning the engine over trying to start the truck...makes me think batteries and/or charging system isn't up to par!

-jokester